I certainly cant tell you how to live your life, or what kind of marriage you want in the future, but:
I asked her if she had any fantasies and she said she had a 2M-1F threesome in her younger days and lots of sex (both of which I already knew) but that she would still like to try a 2F-1M threesome. I said that I couldn't consider it unless she came to me with it if/when we reconcile
This is possibly opening Pandora's Box. It either destroys what trust is left, or it becomes so much fun, that it becomes the norm instead of the exception. Be careful what you wish for. This is walking a very dangerous line. I've seen this a few times, and the 2x the marriage ENDED FAST AND FURIOS, the other time, the marriage became open/swapping.
